FIRST HARD X-RAY DETECTION OF THE NON-THERMAL EMISSION AROUND THE ARCHES CLUSTER: MORPHOLOGY AND SPECTRAL STUDIES WITH NuSTAR
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Krivonos-2014-FIRST HARD X-RAY DET.pdf
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Checksum (MD5)
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Author(s)
Krivonos, Roman A.
Tomsick, John A.
Bauer, Franz E.
Barriere, Nicolas M.
Bodaghee, Arash
Boggs, Steven E.
Christensen, Finn E.
Craig, William W.
Grefenstette, Brian W.
Hailey, Charles J.
Date Issued
January 2014
Journal
The Astrophysical Journal
Publisher
IOP Publishing
Citation
Krivonos, Roman A., John A. Tomsick, Franz E. Bauer, Frederick K. Baganoff, Nicolas M. Barriere, Arash Bodaghee, Steven E. Boggs, et al. “FIRST HARD X-RAY DETECTION OF THE NON-THERMAL EMISSION AROUND THE ARCHES CLUSTER: MORPHOLOGY AND SPECTRAL STUDIES WITH NuSTAR.” The Astrophysical Journal 781, no. 2 (January 15, 2014): 107. © 2014 The American Astronomical Society
Version
Final published version
Abstract
The Arches cluster is a young, densely packed massive star cluster in our Galaxy that shows a high level of star formation activity. The nature of the extended non-thermal X-ray emission around the cluster remains unclear. The observed bright Fe Kα line emission at 6.4 keV from material that is neutral or in a low ionization state can be produced either by X-ray photoionization or by cosmic-ray particle bombardment or both. In this paper, we report on the first detection of the extended emission around the Arches cluster above 10 keV with the NuSTAR mission, and present results on its morphology and spectrum. The spatial distribution of the hard X-ray emission is found to be consistent with the broad region around the cluster where the 6.4 keV line is observed. The interpretation of the hard X-ray emission within the context of the X-ray reflection model puts a strong constraint on the luminosity of the possible illuminating hard X-ray source. The properties of the observed emission are also in broad agreement with the low-energy cosmic-ray proton excitation scenario.
MIT Department
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
https://doi.org/10.1088/0004-637x/781/2/107
